qemu

FORK: QEMU emulator
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cpu.c (3896B)

      1 /*
      2  *  PowerPC CPU routines for qemu.
      3  *
      4  * Copyright (c) 2017 Nikunj A Dadhania, IBM Corporation.
      5  *
      6  * This library is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Lesser General Public
      8  * License as published by the Free Software Foundation; either
      9  * version 2.1 of the License, or (at your option) any later version.
     10  *
     11  * This library is distributed in the hope that it will be useful,
     12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * Lesser General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU Lesser General Public
     17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
     18  */
     19 
     20 #include "qemu/osdep.h"
     21 #include "cpu.h"
     22 #include "cpu-models.h"
     23 #include "cpu-qom.h"
     24 #include "exec/log.h"
     25 #include "fpu/softfloat-helpers.h"
     26 #include "mmu-hash64.h"
     27 #include "helper_regs.h"
     28 #include "sysemu/tcg.h"
     29 
     30 target_ulong cpu_read_xer(const CPUPPCState *env)
     31 {
     32     if (is_isa300(env)) {
     33         return env->xer | (env->so << XER_SO) |
     34             (env->ov << XER_OV) | (env->ca << XER_CA) |
     35             (env->ov32 << XER_OV32) | (env->ca32 << XER_CA32);
     36     }
     37 
     38     return env->xer | (env->so << XER_SO) | (env->ov << XER_OV) |
     39         (env->ca << XER_CA);
     40 }
     41 
     42 void cpu_write_xer(CPUPPCState *env, target_ulong xer)
     43 {
     44     env->so = (xer >> XER_SO) & 1;
     45     env->ov = (xer >> XER_OV) & 1;
     46     env->ca = (xer >> XER_CA) & 1;
     47     /* write all the flags, while reading back check of isa300 */
     48     env->ov32 = (xer >> XER_OV32) & 1;
     49     env->ca32 = (xer >> XER_CA32) & 1;
     50     env->xer = xer & ~((1ul << XER_SO) |
     51                        (1ul << XER_OV) | (1ul << XER_CA) |
     52                        (1ul << XER_OV32) | (1ul << XER_CA32));
     53 }
     54 
     55 void ppc_store_vscr(CPUPPCState *env, uint32_t vscr)
     56 {
     57     env->vscr = vscr & ~(1u << VSCR_SAT);
     58     /* Which bit we set is completely arbitrary, but clear the rest.  */
     59     env->vscr_sat.u64[0] = vscr & (1u << VSCR_SAT);
     60     env->vscr_sat.u64[1] = 0;
     61     set_flush_to_zero((vscr >> VSCR_NJ) & 1, &env->vec_status);
     62 }
     63 
     64 uint32_t ppc_get_vscr(CPUPPCState *env)
     65 {
     66     uint32_t sat = (env->vscr_sat.u64[0] | env->vscr_sat.u64[1]) != 0;
     67     return env->vscr | (sat << VSCR_SAT);
     68 }
     69 
     70 /* GDBstub can read and write MSR... */
     71 void ppc_store_msr(CPUPPCState *env, target_ulong value)
     72 {
     73     hreg_store_msr(env, value, 0);
     74 }
     75 
     76 #if !defined(CONFIG_USER_ONLY)
     77 void ppc_store_lpcr(PowerPCCPU *cpu, target_ulong val)
     78 {
     79     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
     80     CPUPPCState *env = &cpu->env;
     81 
     82     env->spr[SPR_LPCR] = val & pcc->lpcr_mask;
     83     /* The gtse bit affects hflags */
     84     hreg_compute_hflags(env);
     85 
     86     ppc_maybe_interrupt(env);
     87 }
     88 #endif
     89 
     90 static inline void fpscr_set_rounding_mode(CPUPPCState *env)
     91 {
     92     int rnd_type;
     93 
     94     /* Set rounding mode */
     95     switch (env->fpscr & FP_RN) {
     96     case 0:
     97         /* Best approximation (round to nearest) */
     98         rnd_type = float_round_nearest_even;
     99         break;
    100     case 1:
    101         /* Smaller magnitude (round toward zero) */
    102         rnd_type = float_round_to_zero;
    103         break;
    104     case 2:
    105         /* Round toward +infinite */
    106         rnd_type = float_round_up;
    107         break;
    108     default:
    109     case 3:
    110         /* Round toward -infinite */
    111         rnd_type = float_round_down;
    112         break;
    113     }
    114     set_float_rounding_mode(rnd_type, &env->fp_status);
    115 }
    116 
    117 void ppc_store_fpscr(CPUPPCState *env, target_ulong val)
    118 {
    119     val &= FPSCR_MTFS_MASK;
    120     if (val & FPSCR_IX) {
    121         val |= FP_VX;
    122     }
    123     if ((val >> FPSCR_XX) & (val >> FPSCR_XE) & 0x1f) {
    124         val |= FP_FEX;
    125     }
    126     env->fpscr = val;
    127     env->fp_status.rebias_overflow  = (FP_OE & env->fpscr) ? true : false;
    128     env->fp_status.rebias_underflow = (FP_UE & env->fpscr) ? true : false;
    129     if (tcg_enabled()) {
    130         fpscr_set_rounding_mode(env);
    131     }
    132 }